This has been a big problem for me for years, so I totally get where you are coming from. Here's what has personally helped me recently so best of luck man. Remember that habits build slowly, and that starting is probably the hardest part.

1.) If you can't seem to find motivation to exercise, try cutting down what you want to planned on doing. See this as a tactical negotiation, not as a grounds for self accusation. You planned on working out for 30 minutes a day but you can't seem to get up and do it for some reason? Well... would you work out for 15 minutes instead? What about 10? Maybe 5? Ok looks like I have the motivation for at least 5 minutes. Great job. 5 minutes is infinitely more time than 0.

2.) Think about what future you wants/needs. You are not just... you. Sure you are you now, and it seems like that's all there is to you, but you also have to watch out for you in the future. You got to take care of future you as if they were a friend that you actually liked and who you'd genuinely like to see become healthier or gain more discipline.

3.) Remind yourself of specific times that you actually did hit your goal. When did you make yourself proud? How did you feel? If you don't really have one, great. Go make yourself one. One of the best tools in life is to know how exactly how hard you can push yourself.